March 9, 2017A15:35:39 UT Orbital elements: C/2017 E2 (XuYi) T 2016 July 20.21429 TT Sato q 1.5108120 (2000.0) P Q Peri. 72.57738 +0.15705958 -0.96277840 Node 15.06433 +0.20036435 -0.18704535 e 1.0 Incl. 57.82022 +0.96705037 +0.19511992 From 47 observations 2017 Mar. 1-9, mean residual 0".53. Residuals in seconds of arc 170301 D29 0.0 0.6- 170303 K65 0.5- 0.3+ 170304 G96 0.2- 0.8+ 170301 D29 0.2+ 0.5- 170303 K65 0.3- 0.5- 170304 G96 0.5+ 1.4+ 170301 D29 0.1+ 1.1- 170303 K65 0.1- 0.2- 170304 G96 0.0 1.0+ 170302 I52 0.1+ 0.9- 170303 G45 0.4- 0.3+ 170304 691 0.2- 0.5+ 170302 I52 0.8- 1.2- 170303 G45 0.3- 0.1+ 170304 691 0.5+ 0.5+ 170302 I52 0.4- 0.6- 170303 G45 0.3- 0.3+ 170304 691 0.1+ 1.3+ 170302 I52 0.2+ 0.6- 170303 G45 0.3+ 0.4+ 170305 H01 0.3+ 0.3+ 170302 691 0.5- 0.3+ 170303 G45 0.2- 0.2+ 170305 H01 0.2+ 0.2+ 170302 691 0.4- 0.3- 170303 H01 0.1+ 0.1- 170305 H01 0.1+ 0.3+ 170302 691 0.4- 0.2- 170303 H01 0.0 0.0 170305 H01 0.1+ 0.4+ 170302 G96 0.3+ 0.5- 170303 H01 0.2+ 0.0 170305 D29 0.2- 1.1+ 170302 G96 0.0 0.0 170303 H01 0.1+ 0.1- 170305 D29 0.1+ 0.9+ 170302 G96 0.4- 0.5- 170303 H01 0.2+ 0.0 170305 D29 0.3+ 0.6+ 170302 D29 0.0 0.0 170303 H01 0.3+ 0.1- 170309 W96 0.3- 2.0- 170302 D29 0.1+ 0.1- 170303 H01 0.5+ 0.0 170309 W96 0.5- 1.7- 170302 D29 0.4+ 0.6+ 170303 H01 0.7+ 0.1- March 8, 2017A00:58:03 UT Orbital elements: C/2017 E2 (XuYi) T 2016 July 19.79962 TT Sato q 1.5125804 (2000.0) P Q Peri. 72.59007 +0.15762309 -0.96268755 Node 15.03950 +0.19793890 -0.18743484 e 1.0 Incl. 57.96513 +0.96745809 +0.19519444 From 40 observations 2017 Mar. 1-5, mean residual 0".35. --